Reciprocating electric motor.



PATENTED FEB. 21, 1905.

L. CASPER. REOIPROGATING ELECTRIC MOTOR.

APPLICATION FILED MAR. 28, 1903.

mfnesses' UNITED STATEs Patented February 21, 1905.

LOUIS (JASPER, OF CHICAGO, ILLINOIS.

RECIPROCATING ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 783,102, dated February 21, 1905. Application filed March 23, 1903. Serial No. 149,063.

To all whom, it may cmwern:

Be it known that I, LoUIs CAsPER, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Reciprocating Electric Motors, of which the following is a specification.

The present invention relates to a motor of the class described, the object being to provide a compact, portable, and comparatively simple appliance especially for using where a light power is required, such as for operating dental instruments, reciprocating drills, massage devices, 850. This I accomplish by means embodying some novel features of constructions, among which are a" reciprocating armature carrying a driving-rod for operating such mechanism as may be desired, an electromagnet provided with a central hollow core through which the driving-rod passes, the said magnet having an exterior cylindrical extension which also actuates the armature. These and other features are illustrated in the accompanying drawings and will hereinafter be'fully described.

In the drawings, Figure 1 is the front elevation of a motor embodying features of my invention, a drilling attachment being shown to illustrate one of the purposes for which the motor may be applied. Fig. 2 is a sectional elevation of the motor. Fig. 3 is a transverse section taken on the line 3 3 of Fig. 2, and Fig. 4 is a diagrammatic View showing the wiring of the motor.

A refers as a whole to an electromagnet in which a is a core or bar of soft iron provided with a central bore a. Surrounding the core is an electric coil X, having Wires or a circuit :0 a and a suitable source of electrical power Y. Attached to one end of the core a is a cylindrical extension B of soft iron. This is of n shape in longitudinal section, the upper or cross part 6 being attached to the core a by a hollow screw-headed bolt 6 The extension B surrounds the magnet A proper, forming acasing, while the lower end I) forms an annular pole which amplifies the magnetic influence of the appliance so as to attract the armature with greater force than could be obtained by the core a alone.

C is an armature, preferably of disk shape.

Attached to this armature is a drive rod or shaft D.

The rod D passes through the aperture (6'- in the core a of the electromagnet. This rod extends beyond the said magnet and forms an actuating medium for such mechanism as may be desired to be operated.

In Fig. 1 I have shown a reciprocating drill I mounted in a guideway I, which is attached to the bracket E; but any other suitable device may be attached to it. While the main shaft or rod has a reciprocating motion, it can be readily understood that the same may be converted into a rotary motion by any suitable mechanical device. In Fig. 1 I have shown means for giving a rotating movement to the main rod or its attachment. This consists of an electromagnet H, a battery or other source of electric power Gr, a circuit 7L ii, an armature if, a pivoted arm 7r, operating a ratchet it", which moves a ratchet-wheel if in engagement with the drill I.

Attached to the top of the appliance is a bracket E, and pivotally attached to same is a circuit-breaking device F. This consists, preferably, of a blade f, through which the driving-rod D passes. The said rod is screwthreaded at cl and is provided with stops or nuts d, the intention being that the rod will move a certain distance before actuating the circuit-breaker. Above one of the nuts is a spring 70 to retract or move the rod D back after a forward movement.

The circuit-breaking device is preferably constructed as follows: fis a blade or bar pivotally attached at a to the bracket E. At the forward end of the blade f is a spring f, having a roller f the same being sometimes termed a jockey-roller. This roller engages the forward end of the blade f and retains it in a downward position until the rod D or its nut presses it upward. The blade thus moves very quickly into its secondary position and at the same time separates the contact-points f and f the said points being in the circuit 00 m, with the point f attached to the blade f.

What I claim is 1. In a device of the class described, an elec-' tromagnetic coil, surrounded by a shell or IOC case B and having a core a, provided with a l adjustable stops or nuts for engaging the said bore a, an armature C having a rod or shaft D extending through the core a, a yoke or bracket E having a tongue or strip F, which is engaged by stops on the said shaft d, a roller having a spring-contact with the end of the tongue F, and the said tongue having a contact-piece f", which engages a contact-piece f, as set forth.

2. A device of the class described, the bracket E secured to the casing of the instrument by a screw 6 which enters the core of the coil A, the said bracket being provided with a pivoted tongue F, means for moving or actuating said tongue, and a roller mounted on a spring for engaging the end of the said tongue, as set forth.

3. A motor of the class described, the electromagnetic coil X inclosed in a shell A, and having a core (0 provided with a bore a, an armature C, having a rod D which passes through the core a, the said rod extending through a pivoted tongue F and provided with tongue, the said tongue having a contact-piece which breaks the circuit, as set forth.

I. In combination, a coil X, the corc a having a bore a, a shell B, surrounding the said coil, an armature C, having a rod D passing through the core a, and provided with a circuit-breaker consisting of a pivoted tongue, engaged by stops (1 on the rod D, the said tongue having a spring engagement at its outer end as set forth.

5. In combination, a motor of the class described having a coil with a tubular core and an armature having reciprocating rods passing through the said core, the said rod having means for engaging a pivoted device, provided with a circuit-breaker, as set forth.

Signed this 20th day of March, A. D. 1903.

LOUIS CASPER.

In presence o f SAM J. GonMAN, A. J. BELL. 

